newguyinnc
OBS Enthusiast
- Joined
- Jun 1, 2014
- Messages
- 51
- Reaction score
- 14
Lol...I did throw a parts cannon at it, but not specifically for this particular problem. I bought this truck to tow a trailer with to make deliveries for my business. I got the truck cheap enough that I planned on rebuilding the motor anyway for piece of mind and reliability. Has correct coolant mix, not blowing anything into the overflow tank that I've been able to see. I've talked to several people with gen6 big blocks and most of them say these trucks run a little hotter on the driver's side than the passenger side of the block. The thing that has me stumped is the radiator temps are good, the temps at the thermostat housing are good and when checked with my scanner, the temp gun is within 2-3° of what the ecm says on the scanner. But the gauge sending unit in the middle of the head says 235° and I know the gauge is correct. Seems like a flow problem in the block since I've had 3 of the correct water pumps on this truck, but the motor was hot tanked by a very reputable local engine builder when he rebuilt the motor. Have a nearly identical truck to this one , same motor and tranny combination that never goes over 200° no matter what you throw at it with 185,000 miles on it.Do you have the correct coolant mix? And correct functioning radiator cap.
It is a big block, and will generate a lot more heat to transfer.
My 1 ton dually new had 200 or 210 thermostat. After 3000 miles I swapped it out for 185.
Going over I-80, Donner Summit, to Reno, in the bed luggage,tack, six bale's alfalfa. Pulling a two horse trailer with change storage area, never got over 200, yeah August vacation.
It sounds like you loaded a parts Cannon and blasted everything at it.
But you haven't actually found the cause.
It runs at higher temp. Does it boil over? Does it pressurize the cooling system beyond normal? Do you experience any pre-ignition.
During a loaded, working condition did the temp go unusually high, or slight equal to increased load ?
What does the service manual reference with this model and build?
What are other similar built trucks experiencing?
Have you checked for Service Bulletins on your model build or any big block trucks? That's what I would do. Good luck